import java.util.Scanner;

public class Method {

//    方法的定义：修饰符 返回值类型 方法名字
    public static boolean isLeapYear(int year){
        if (0 == year % 4 && 0 != year % 100 ||0 == year % 400){
            return true;
        }else{
            return false;
        }
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        while (true){
            int year = sc.nextInt();
            boolean flag = isLeapYear(year);
            if(flag){
                System.out.println("润");
            }else{
                System.out.println("不润");
            }
        }
    }
}
